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Solution 2.1:2a

From Förberedande kurs i matematik 1

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First, multiply the brackets together. In the first product, every term in the first bracket is multiplied by every term in the second bracket,
First, multiply the brackets together. In the first product, every term in the first bracket is multiplied by every term in the second bracket,

Revision as of 10:01, 13 August 2008

First, multiply the brackets together. In the first product, every term in the first bracket is multiplied by every term in the second bracket,

(x−4)(x−5)−3x(2x−3)=xx−x5−4x−4(−5)−(3x2x−3x3)=x2−5x−4x+20−(6x2−9x)=x2−5x−4x+20−6x2+9x

Then, gather together x2−x− and the constant terms and simplify

=(x2−6x2)+(−5x−4x+9x)+20=−5x2+0+20=−5x2+20

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