How do you multiply #(9x + 8)(9x + 3)#?

1 Answer
Tony B
Sep 4, 2016

#81x^2+99x+24#

Explanation:

Consider: #color(blue)((9x+8)color(brown)((9x+3))#

Multiply everything inside the right hand side (RHS) bracket by everything in the left hand side (LHS) bracket. Giving:

Notice that the + from #+8 # follows the 8

#color(brown)(color(blue)(9x)(9x+3)color(white)(.......) color(blue)(+8)(9x+3))#

#81x^2+27xcolor(white)(......) +72x+24#

#81x^2+99x+24#

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