Solution assignment 07 The basics

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Assignment 7

Solve the following equations with the sum-product method

x^2-12x-85=0

3x^2-12x+9=0

x^2-10x+21=0

Solution

Just take a look at the rules of the sum-product method and then we can easily find the solutions:

(x-17)(x+5)=0, dus x=17 of x=-5

For the next assignment we first divide left- and right-hand side by 3. Then we factorize the left-hand side:

(x-3)(x-1)=0, dus x=3 of x=1

We can solve the last assignment by factorizing the left-hand side:

(x-7)(x-3)=0, en dus x=7 of x=3

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