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3 years ago

K2-4K-21. How do you factor this

1 answer:

4 0

Assuming yo mean
k²-4k-21

factor by doing
what 2 numbers multipily to get -21 and add to get -4?
-7 and 3

(k-7)(k+3) is factored

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I'm stuck with this simultaneous equation. Can anyone help me please?

professor190 [17]

Multiply (h+3t= -10) to get 2h+6t=-20.

(<span>2h+6t=-20</span>) - (2h+t=-8) to get 5t=-28
therefore t=-5.6

put t into any equation. i.e (2h-t=-8) = 2h+5.6=-8
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iVinArrow [24]

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