Question

Find the values equations of K that they for each of the following quadratic have two equal roots. 4x²+8x-k=0​

Answer 1

Hello There!

4x2+8x-k=0

a=4

b-8

c=-k

$b^2-4ac\geq 0$

$8^2-4(4)(-k)\geq 0\\64+16k\geq 0\\k\leq- \frac{64}{16} \leq -4\\Therefore, \\k\leq -4$

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