find the product of the following
a.(x+4)(x+12)
b. (x+10)(x-5)
c. (x-2)(x-3)
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Using identity
(x+a)(x+b)=x²+(a+b)x+ab
a. a=4 b=12
(x+4)(x+12)=x²+(4+12)x+4×12
=x²+16x+48
b.a=10 b=-5
(x+10)(x-5)=x²+{10+(-5)}x+10×(-5)
=x²+5x+(-50)
=x²+5x-50
c.a=(-2) b=(-3)
(x-2)(x-3)=x²+{(-2)+(-3)}x+(-2)×(-3)
=x²+(-5)x+6
=x²-5x+6
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