If m-2- find the value of-i m-2 ii 3 m-5 iii 9-5 miv 3 m2-2 m-7- v 5 m-2-4

(i) m − 2 = 2 − 2 = 0 (ii) 3m − 5 = (3 × 2) − 5 = 6 − 5 = 1 (iii) 9 − 5m = 9 − (5 × 2) = 9 −10 = −1 (iv) 3m2 − 2m − 7 = 3 × (2 × 2) − (2 × 2) − 7 = 12 − 4 ...

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Standard VII

Mathematics

Multiplication of Integers

If m=2, find ...

Question

If $m = 2,$ find the value of:
(i) $m - 2$ (ii) $3 m - 5$ (iii) $9 - 5 m$
(iv) $3 m^{2} - 2 m - 7$ (v) $\frac{5 m}{2} - 4$

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Solution

(i) $m - 2$
When $m = 2, m - 2 = 2 - 2 = 0$
(ii) $3 m - 5$
When $m = 2, 3 m - 5 = (3 \times 2) - 5 = 6 - 5 = 1$
(iii) $9 - 5 m$
When $m = 2, 9 - 5 m = 9 - (5 \times 2) = 9 - 10 = - 1$
(iv) $3 m^{2} - 2 m - 7$
When $m = 2,$ then $3 m^{2} - 2 m - 7 = 3 \times (2^{2}) - (2 \times 2) - 7$
$= 12 - 4 - 7 = 1$
(v) $\frac{5 m}{2} - 4 = [\frac{5 \times 2}{2}] - 4 = 1$

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Similar questions

Q. If

m = 2

, find the value of:

m - 2, 3 m - 5, 9 - 5 m

3 m^{2} - 2 m - 7

\frac{5 m}{2} - 4

If $m = 2$ , find the value of $3 m^{2} - 2 m - 7$ .

Find the value of:

(i) $(- 4) \div \frac{2}{3}$

(ii) $\frac{- 3}{5} \div 2$

(iii) $\frac{- 4}{5} \div - 3$

(iv) $\frac{- 1}{8} \div \frac{3}{4}$

(v) $\frac{- 2}{13} \div \frac{1}{7}$

(vi) $\frac{- 7}{12} \div \frac{- 2}{13}$

(vii) $\frac{3}{13} \div \frac{- 4}{65}$

Q. For

m = 3

find the value of the following expressions:

\frac{5 m}{3} - 5

ii)

3 m^{2} - 27 m + 3

iii)

7 m - 20

Q. Find the value of:
(i)

(3^{0} + 4^{- 1}) \times 2^{2}

(ii)

(2^{- 1} \times 4^{- 1}) \div 2^{- 2}

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{(\frac{1}{2})}^{- 2} + {(\frac{1}{3})}^{- 2} + {(\frac{1}{4})}^{- 2}

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If m=2, find the value of:(i) m−2 (ii) 3m−5 (iii) 9−5m(iv) 3m2−2m−7 (v) 5m2−4

(i) m−2 When m=2,m−2=2−2=0(ii) 3m−5When m=2,3m−5=(3×2)−5=6−5=1(iii) 9−5m When m=2,9−5m=9−(5×2)=9−10=−1(iv) 3m2−2m−7When m=2, then 3m2−2m−7=3×(22)−(2×2)−7=12−4−7=1(v) 5m2−4=[5×22]−4=1

If $m = 2,$ find the value of:
(i) $m - 2$ (ii) $3 m - 5$ (iii) $9 - 5 m$
(iv) $3 m^{2} - 2 m - 7$ (v) $\frac{5 m}{2} - 4$