when asked to factor the trinomial 8x2-8x-16, a student gives the answer (x-2)(x+1. What is one thing wrong with this answer?
1 answer:
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Answer: correct answer is B.
Step-by-step explanation:
in the small triangle
taking 60 as reference angle
b =
so
tan 60 = p/b
= p/(
)
30 = p
so
(taking 45 as reference angle)
so
in bigger triangle
b = 20
so
tan 45 = p/b
1 = p/(20)
p = 20
so h^2 = p^2 + b^2
so
h^2 = (20)^2 +( 20
)^2
= 1200 + 1200
h^2 = 2400
h =
=20
so x = 20