Question

b) Simplify: (V2 + 7)(V2 - 3)​

Answer 1

Step-by-step explanation:

$\bold{question} :$

$\mathfrak{( {v}^{2} + 7)( {v}^{2} - 3)}$

$\bold\colorbox{aqua}{answer : }$

$= \bold{ {v}^{2} ( {v}^{2} - 3) + 7( {v}^{2} - 3)}$

Use the formulae or identity:

$\bold{ (x + a)(x + b)}$

$= \bold{ {v}^{4} - 3 {v}^{2} + {7v}^{2} - 21}$

$= \bold{ {v}^{4} + 4 {v}^{2} - 21}$