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Roy Stanton
Mathematics
22 October, 22:42
1. a²-8a=4
2. x²-18x+80=0
+3
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1
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Reece Jacobs
22 October, 22:46
0
A² - 8a = 4
a² - 8a - 4 = 0
a = - (-8) + / - √ ((-8) ² - 4 (1) (-4))
2 (1)
a = 8 + / - √ (64 + 16)
2
a = 8 + / - √ (80)
2
a = 8 + / - 4√ (5)
2
a = 4 + 2√ (5)
a = 4 + 2√ (5) a = 4 - 2√ (5)
x² - 18x + 80 = 0
x = - (-18) + / - √ (-18) ² - 4 (1) (80))
2 (1)
x = 18 + / - √ (324 - 320)
2
x = 18 + / - √ (4)
2
x = 18 + / - 2
2
x = 9 + 1
x = 9 + 1 x = 9 - 1
x = 10 x = 8
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