Question

splotting middle term of 21x2-৪x -4​

Answer 1

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Answer 2

Question:

$Factorise \: by \: splitting \: the \: middle \: terms$

$21 {x}^{2} - 8x - 4 = 0$

Answer:

$\boxed{(3x - 2)(7x + 2) = 0}$

Step-by-step explanation:

$21 {x}^{2} - 8x - 4 = 0$

Product :- - 84 = - 14 × 6

Sum :- - 8 = - 14 + 6

$21 {x}^{2} - 14x + 6x - 4 = 0$

$7x(3x - 2) + 2(3x - 2) = 0$

$\boxed{(3x - 2)(7x + 2) = 0}$