How do you multiply #(x + 4)(x + 7)#?

1 Answer
EZ as pi
Jun 30, 2016

=#x^2 +11x +28#

Explanation:

Each term in the first bracket must be multiplied by each term in the second bracket This will give 4 terms which can be simplified to give 3 terms.

#(color(red)x+color(blue)4)(color(teal)x+color(purple)7)#

=#(color(red)x xx color(teal)x )+ (color(red)x xx color(purple)7) + (color(blue)4 xx color(teal)x) + (color(blue)4 xx color(purple)7)#

=#x^2 +7x + 4x +28#

=#x^2 +11x +28#

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