How to simplify (x+2) (x+10) - (x-5) (x-4).find the numerical value of this expression when x=-3
aakree:
(x+2)(x+10). x(x+10)+2(x+10),x2+10X+2x+20,x2+12x+20,
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Answered by
5
(-1*7)-{(-8)(-7)}
=-7-56
=-63
=-7-56
=-63
Answered by
1
(x+2)(x+10)-(x-5)(x-4)
opening brackets and multiplying
∴x^2 +12x+200-(x^2-9x-20)
=x^2-x^2+12x+9x+200+20
=21x+220
take x=3
∴21(3)+220
=63+220
=283
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