Question

Solve the quadratic equation y2 - 5y = -4 by factoring.

Answer 1

first you'll need to put it in standard form: \(\large y^2-5y+4=0 \)
now, think what two numbers, r1 and r2 such that:

r1 + r2 = -5 AND r1 * r2 = 4

can you think of any ?

Answer 2

nope

Answer 3

you can't think of any two numbers that multiply to 4?