C. 7 cm the first triangle is twice the size of the second
Answer:
D
Step-by-step explanation:
With no middle term, we factor the quadratic into two binomials of the form (x+a)(x-a) where a is the same number. 64 factors only into 8(8) where the factors are equal. We write in the form (x+8)(x-8).
To find the root or x-intercept, we set equal to 0.
(x+8)(x-8)=0
x=-8,8.
<u><em>The equation is already in the standard form.
</em></u>
=
10
x
+
5
