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anonymous
 one year ago
Solve x2 − 8x − 20 = 0.
x = 4, x = −5
x = −4, x = 5
x = 2, x = −10
x = −2, x = 10
anonymous
 one year ago
Solve x2 − 8x − 20 = 0. x = 4, x = −5 x = −4, x = 5 x = 2, x = −10 x = −2, x = 10

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@mathmate @Teddyiswatshecallsme

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2you need to find 2 numbers whose product = 20 and whose sum = 8

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2these will be the values of a and b in the factors of the expression (x + a)(x + b) = 0 you can then find the zeroes

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2try factoring 10 and see if you can make 8 from 2 of the factors

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2sorry thats 20 not 10

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ok I think I understand what you mean...... ok so 10 * 2 = 20....... and then I have to find a way to make 20 equal 8....?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2you are on the right track 10 and 2 is right because 10 + 2 = 8

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2so that the factors are (x  10 )(x + 2)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh wow that was suprisingly simple.....

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2yea when you expand the factors the 10*x and 2*x make 8x

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2yw now to get the zeros you equate to 0 (x  10)(x + 2) = 0 means that x10 = 0 or x + 2 = 0 so the zeros are 10 and 2
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