Question

2x²+11x-21 factorise it​

Answer 1

$\huge{\boxed{\sf{SOLUTION :}}}$

${2x}^{2} + 11x - 21$

${2x}^{2} + (14 - 3)x - 21$

${2x}^{2} + 14x - 3x - 21$

$2x(x + 7) - 3(x + 7)$

$(x + 7)(2x - 3)$

Answer 2

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Here is your answer♥

Answer..

x = 3/2 or x = -7

Step by step explanation

$2 {x}^{2} + 11x - 2 \\ = 2 {x}^{2} + 14x - 3x - 21 \\ = 2x(x + 7) - 3(x + 7) \\ (x + 7)(2x - 3) = 0 \\ = x + 7 = 0 \: \: or \: \: 2x - 3 = 0 \\ = x = - 7 \: \: or \: \: x = \frac{3}{2}$

By factorisation I solved to find the value of x.

Hope it helps you♥