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Standard VII

Mathematics

Finding the Value of an Expression

Question 6The...

Question

Question 6
The value of the polynomial $5 x - 4 x^{2} + 3$ , when $x = - 1$ is

A) -6
B) 6
C) 2
D) -2

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Solution

The answer is A.
Given $p (x) = 5 x - 4 x^{2} + 3$ ...(i)
On putting x = -1 in eq.(i) we get,
$P (- 1) = 5 (- 1) - 4 (- 1)^{2} + 3 = - 5 - 4 + 3 = - 6$

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Similar questions

Q. Find the value of the polynomial

4 x^{2} - 5 x + 3

, when

x = \frac{1}{2}

Q. The value of

\sqrt{5 + 2 \sqrt{6}}

is
(a)

\sqrt{5} + \sqrt{6}

(b)

\sqrt{5} - \sqrt{6}

(c)

\sqrt{3} + \sqrt{2}

(d)

\sqrt{3} - \sqrt{2}

Find the value of the polynomial $5 x - 4 x^{2} + 3$ at
(i) $x = 0$
(ii) $x = - 1$
(iii) $x = 2$

Q. Question 1
Find the value of the polynomial

5 x - 4 x^{2} + 3

at
(i) x = 0
(ii) x = - 1
(iii) x = 2

Question 6
The value of $(t a n 1^{\circ}, t a n 2^{\circ}, t a n 3^{\circ} \dots \dots t a n 89^{\circ})$ is

(A) 0
(B) 1
(C) 2
(D) $\frac{1}{2}$

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Finding the Value of an Expression

Standard VII Mathematics

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Question 6 The value of the polynomial 5x–4x2+3, when x=−1 is A) -6 B) 6 C) 2 D) -2

The answer is A. Given p(x)=5x–4x2+3 ...(i) On putting x = -1 in eq.(i) we get, P(−1)=5(−1)−4(−1)2+3=−5−4+3=−6

Question 6
The value of the polynomial $5 x - 4 x^{2} + 3$ , when $x = - 1$ is

A) -6
B) 6
C) 2
D) -2

The answer is A.
Given $p (x) = 5 x - 4 x^{2} + 3$ ...(i)
On putting x = -1 in eq.(i) we get,
$P (- 1) = 5 (- 1) - 4 (- 1)^{2} + 3 = - 5 - 4 + 3 = - 6$