What should be the value of a- if the value of 2x-2 nbsp- 6a - 5x - 10 is 25- when x - 1- 6-3-3-6-

The correct option is B 3 Given: 2x^2 nbsp;+ 6a – 5x + 10 = 25 at x=1 on substituting the value of x = 1 in the above equation, we get, 2(1)^2 + 6a 5( ...

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Standard VII

Mathematics

Addition of Algebraic Expressions

What should b...

Question

What should be the value of a, if the value of $2 x^{2} + 6 a - 5 x + 10$ is $25$ , when $x = 1$ ?

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Solution

The correct option is B
3

Given: $2 x^{2} + 6 a - 5 x + 10 = 25 at x = 1$

on substituting the value of $x = 1$ in the above equation, we get,

$2 (1)^{2} + 6 a - 5 (1) + 10 = 25$

$\Rightarrow 2 + 6 a - 5 + 10 = 25$

$\Rightarrow 6 a + 7 = 25$

$\Rightarrow 6 a = 25 - 7 = 18$

$\Rightarrow 6 a = 18$

$\Rightarrow a = 3$

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What should be the value of a, if the value of 2x2+6a–5x+10 is 25, when x=1?

The correct option is B 3 Given: 2x2+6a –5x+10=25 at x=1 on substituting the value of x=1 in the above equation, we get, 2(1)2+6a−5(1)+10=25 ⇒2+6a−5+10=25 ⇒6a+7=25 ⇒6a=25−7=18 ⇒6a=18 ⇒a=3

What should be the value of a, if the value of $2 x^{2} + 6 a - 5 x + 10$ is $25$ , when $x = 1$ ?