Find the value of an expression
- 5x² -
2x + 19 for x=2
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Answer:
The first term is, 5x2 its coefficient is 5 .
The middle term is, +2x its coefficient is 2 .
The last term, "the constant", is -19
Step-1 : Multiply the coefficient of the first term by the constant 5 • -19 = -95
Step-2 : Find two factors of -95 whose sum equals the coefficient of the middle term, which is 2 .
-95 + 1 = -94
-19 + 5 = -14
-5 + 19 = 14
-1 + 95 = 94
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