Use suitable identities to find the following product: (x + 8) (x – 10)

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Solution

Using identity, (x + a) (x + b) = $x^{2}$ + (a+b)x + ab
(x + 8) (x – 10) = $x^{2}$ + (8+(-10))x + (8)(-10)
= $x^{2}$ +(8-10)x - 80
= $x^{2}$ -2x - 80
(Note, you may use identity, (x + a) (x - b) = $x^{2}$ + (a-b)x - ab directly here)

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Use suitable identities to find the following product: (x + 8) (x – 10)

Using identity, (x + a) (x + b) = x2 + (a+b)x + ab (x + 8) (x – 10) = x2 + (8+(-10))x + (8)(-10) = x2 +(8-10)x - 80 = x2 -2x - 80 (Note, you may use identity, (x + a) (x - b) = x2 + (a-b)x - ab directly here)

Using identity, (x + a) (x + b) = $x^{2}$ + (a+b)x + ab
(x + 8) (x – 10) = $x^{2}$ + (8+(-10))x + (8)(-10)
= $x^{2}$ +(8-10)x - 80
= $x^{2}$ -2x - 80
(Note, you may use identity, (x + a) (x - b) = $x^{2}$ + (a-b)x - ab directly here)