What is factor y^2-4y-21 ?

The solution to factor y^2-4y-21 is (y+3)(y-7)

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factor y^2-4y-21

factor

y^{2} - 4 y - 21

(y + 3) (y - 7)

Solution steps

y^{2} - 4 y - 21

Break the expression into groups

= (y^{2} + 3 y) + (- 7 y - 21)

Factor out

y

from

y^{2} + 3 y : y (y + 3)

Factor out

- 7

from

- 7 y - 21 : - 7 (y + 3)

= y (y + 3) - 7 (y + 3)

Factor out common term

y + 3

= (y + 3) (y - 7)

\frac{5}{- 8}

\frac{1}{3} y = y - 60

- 4 r - 11 = 4 r + 21

s^{2} - 14 s + 45 = 0

26 < x + 16