Question 7x -4-5 x -10

X=4/5(x+10) ⇒ 5x=4(x+10) ⇒ 5x=4x+40 ⇒ 5x 4x =40 ⇒ x =40 To check: x=4/5(x+10)⇒ 40=4/5(40+10) ⇒ 40 =4/5× 50 ⇒ 40 =4 × 10 ⇒ 40=40 ⇒ L.H.S=R.H.S. Hence, it is corr ...

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Standard IX

Mathematics

Polynomial Expressions

Question 7x =...

Question

Question 7
$x = \frac{4}{5} (x + 10)$

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Solution

$x = \frac{4}{5} (x + 10)$
$\Rightarrow 5 x = 4 (x + 10)$
$\Rightarrow 5 x = 4 x + 40$
$\Rightarrow 5 x - 4 x = 40$
$\Rightarrow x = 40$
To check:
$x = \frac{4}{5} (x + 10) \Rightarrow 40 = \frac{4}{5} (40 + 10)$
$\Rightarrow 40 = \frac{4}{5} \times 50 \Rightarrow 40 = 4 \times 10$
$\Rightarrow 40 = 40$
$\Rightarrow L . H . S = R . H . S$ .
Hence, it is correct.

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Similar questions

Factorise:
(i) $12 x^{2} - 7 x + 1$
(ii) $2 x^{2} + 7 x + 3$
(iii) $6 x^{2} + 5 x - 6$
(iv) $3 x^{2} - x - 4$

Q. Question 4
Factorise:
(i)

12 x^{2} - 7 x + 1

(ii)

2 x^{2} + 7 x + 3

(iii)

6 x^{2} + 5 x - 6

(iv)

3 x^{2} - x - 4

Q. Solve for

x

\frac{2 - 7 x}{1 - 5 x} = \frac{3 + 7 x}{4 + 5 x}

Q. Solve the following question.

7 - 5 x = 5 - 7 x

Q. Solve

5 x = 7 x - \frac{10}{7}

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Polynomial Expressions

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Question 7 x=45(x+10)

x=45(x+10) ⇒5x=4(x+10) ⇒5x=4x+40 ⇒5x−4x=40 ⇒x=40 To check: x=45(x+10)⇒40=45(40+10) ⇒40=45×50⇒40=4×10 ⇒40=40 ⇒L.H.S=R.H.S. Hence, it is correct.

Question 7
$x = \frac{4}{5} (x + 10)$