Question

Which of the binomials below is a factor of this trinomial? 15x^2+13x-20

Answer 1

SOLUTION:

Factorising to find factors of the trinomial -

15x^2 + 13x - 20 = 0

15x^2 + 25x - 12x - 20 = 0

5x ( 3x + 5 ) - 4 ( 3x + 5 ) = 0

( 3x + 5 ) ( 5x - 4 ) = 0

Solving for x -

3x + 5 = 0

3x = - 5

x = - 5 / 3

OR

5x - 4 = 0

5x = 4

x = 4 / 5

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