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juin [17]
3 years ago
11

there are two factors of -36 such thatone factor is 11 less than half of the other factor. choose all the pairs of these factors

. -2 and 18 , -6 and 6, 3 and -12 , 4 and 9
Mathematics
1 answer:
aleksandrvk [35]3 years ago
7 0
Let one factor be x. Second factor is 11 less than half of this factor, so second factor will be (0.5x - 11). The product of these two factors is -36.

So,

-36=x(0.5x-11) \\  \\ 
-36=0.5 x^{2} -11x \\  \\ 
-72= x^{2} -22x \\  \\ 
 x^{2} -22x+72=0 \\ \\ x^{2} -18x-4x+72=0 \\  \\ 
x(x-18)-4(x-18)=0 \\  \\ 
(x-4)(x-18)=0 \\  \\ 
x=4, x=18

If,
x = 4, the other factor will be = 0.5(4) - 11 = - 9
If,
x = 18, the other factor will be = 0.5(18) - 11 = -2

So, there are two possible set of factors.
1) 4 and -9
2) -2 and 18

From these -2 and 18 is available in the options. So this is the correct answer. 
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