Question

85. Factorize the following expressions : x2 + 4x-21
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Answer 1

$\large{explanation}$

${x }^{2} + 4x - 21$

${x}^{2} + 7x - 3x - 21$

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

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

Answer 2

Answer:

Step-by-step explanation:

the given equation is x² + 4x -21

now p(x) = x² + 4x -21

              = x² +7x -3x -21

              = x (x + 7) - 3 (x+7)

              = (x -3)(x+7

the zeros are 3 and -7