Use Exercise 1 to factor each trinomial.
a. 4x2 + 4x – 5
b. 25x2 + 40x + 11
c. 25x2 – 30x + 4
d. 72x2 + 95x – 1000
Exercise 1
Suppose r and s are the roots of the quadraticequation ax2 + bx + c = 0. Show that you can write ax2 + bx + c = a(x – r)(x – s). Thus, the quadratic trinomial can be written in factored form.
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