Question

if (x+2)(x-5)=x^2+(a+b)x+axb then value of (a+b) is:
a)3
b)-3
c)7
d)-10​

Answer 1

Answer:

x(x-5)+2(x-5)=x^2+(a+b)x+ab

x^2-5x+2x-10=x^2+(a+b)x+ab

x^2-3x-10=x^2+(a+b)x+ab

a+b=-3

Answer 2

Answer:

ab= -10 And a+b = -3

Do u understand

i think

Have a nice day