Question

21x²+11x-2
what will be the answer of the above sum? ​

Answer 1

Answer:

x = -1/7 = -0.143

x = 2/3 = 0.667

Step-by-step explanation:

Answer 2

Answer:

The answer is (x + 14)(x - 3)

Step-by-step explanation:

Factorize by splitting the middle term

Identity (x + a)(x + b) = $x^{2}$ + (a + b) + ab

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

First multiply first with last term

That is,

= 21 X(-2)

= -42

Now find the factors of 42 such that the factors add up to 11x (middle term)

That is 14 and -3(14x - 3x = 11x)

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

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

Now take common

= x(x + 14) -3(x + 14)

Again take common

= (x - 3)(x + 14)