Juli8283
07.04.2020 •
Mathematics
14. The difference of twice a number and 7 is 9.
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Ответ:
16
Step-by-step explanation:
Let the unknown number be x
2x - 7 = 9
2x = 9 + 7
2x = 16
2x÷2 = 16÷2
x = 8
8x2
=16
Ответ:
Step-by-step explanation:
a)
1.5x² + 6x + * = 1.5(x² + 4x + *) =1.5(x² + 2*2x + 4) =1.5(x + 2)²* = 1.5*2² = 6b)
2x² - 5x + * =2(x² - 2.5x + *) = 2(x² - 2*1.25x + 1.25²)=2(x - 1.25)²* = 2*(1.25)² = 3.125 or 25/8