What is factor 20+a^2-21 ?

The solution to factor 20+a^2-21 is (a+1)(a-1)

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factor 20+a^2-21

factor

20 + a^{2} - 21

(a + 1) (a - 1)

Solution steps

20 + a^{2} - 21

Subtract the numbers:

20 - 21 = - 1

= a^{2} - 1

Rewrite

1

1^{2}

= a^{2} - 1^{2}

Apply Difference of Two Squares Formula:

x^{2} - y^{2} = (x + y) (x - y)

a^{2} - 1^{2} = (a + 1) (a - 1)

= (a + 1) (a - 1)

x + (- 4)

(c + 6) + 4 (c + 6)

2 uv - 5 w z + 2 u z - 5 w v

2 e^{8} + e^{5}