HELP find the a,b,c of this table
1 answer:
Answer:
<em>a = b = 1 , c = - 8</em>
Step-by-step explanation:
ax² + bx + c = y
( - 5 )² a - 5b + c = 12
<em>c = - 8</em>
3² a + 3b + c = 4
25a - 5b - 8 = 12 ⇔ 25a - 5b = 20 ⇔ 5a - b = 4 ........ <em>(1)</em>
9a + 3b - 8 = 4 ⇔ 9a + 3b = 12 ⇔ 3a + b = 4 .......... <em>(2)</em>
<em>(1)</em> + <em>(2)</em>
8a = 8 ; <em>a = 1</em>
<em>b = 1</em>
<em>y = x² + x - 8</em>
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Step-by-step explanation:
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