Question

X2+4x-21 std 10 in English medium​

Answer 1

Answer:

Grouping method: In this method we work upon the expression which is of this form x2+ax+band then look for two factors p&q such that

p×q=b&p+q=a

So here for the given polynomial we can perform factorization by grouping method

Answer 2

$\Large{\underline{\underline{\frak{AnswEr\::}}}}$

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

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

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

$</p><p>{\boxed{\LARGE{ \purple{\rm{ \underline{ (x - 3(x + 7) }}}}}}</p><p></p><p>$