Question

find zero of the polynomial 5x square +2x-7

Answer 1

here it is!!!!

= 5x^2+12x+7

= 5x^2+5x+7x+7

= 5x(x+1)+7(x+1)

=) (5x+7)(x+1) so there fore zeroes are x=-1,-7/5

NOW verifications

SO

sum of zeroes = = -b/a

= -1+(-7/5)=-12/5

=) -12/5=-12/5

LHS=RHS

now

product of zeroes!!!!

product =c/a

(-1)(-7/5)=7/5

7/5=7/5

LHS=RHS

hence showed!!!!!!!!!!!

hope it will help you