Question

Which expression is equivalent to (3x2-7) A) (2x2-11)-(x+4) B) (5x²-6)- (2x2-1) C) (10x² - 4)-(7x2+3 D) (15x2 +8)- (18x2+1)

Answer 1

Answer: (c)

Explanation:

Given

The expression is
`3x^2-7`

checking options, for (a)

`\Rightarrow 2x^2-11-x-4\\\Rightarrow 2x^2-x-15`

option (a) is incorrect

for (b)

`\Rightarrow 5x^2-6-2x^2+1\\\Rightarrow 3x^2-5`

option(b) is incorrect

for (c)

`\Rightarrow 10x^2-4-7x^2-3\\\Rightarrow 3x^2-7`

option (c) is matching with the given expression.