In this question, we define a new operation in arithmetic, using xxas a symbol. a xxb = ab + a – b For example, 3xx7 = 21 + 3 -
7 = 17 a.Calculate 5 xx2 b. Calculate 3 xx1/2 c. Solve the equation x xx5 = 8
1 answer:
Answer:
a. 13 , b. = 4 , c. 2.2
Step-by-step explanation:
Given : a xx b = ab + b - a
So, no.1 xx no.2 = Product no.1 x no.2 + no.1 - no.2
As evident 3 xx 7 = (3 x 7) + 3 - 7 → 3 xx 7 = 21 + 3 - 7 = 17
Hence, 5 xx 2 = (5 x 2) + 5 - 2 → 5 xx 2 = 10 + 5 - 2 = 13
3 xx 1/2 = 3 (1/2) + 3 - 1/2 = 1.5 + 3 - 0.5 = 4
x xx 5 = 8
x xx 5 = 5x + x - 5
6x - 5 = 8
6x = 13
x = 2.16 ≈ 2.2
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Step-by-step explanation:
Answer:
n=1
Step-by-step explanation:
distribute
-6 times -8n is =48n
-6 times 6 =-36
8 times -4 = -32
8 times n =8n
rewrite equation
48n-36+-32+8n=-12
48n+8n-36-32=-12
56n-68=-12
add 68 on both sides
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Answer:
15,36,39
Step-by-step explanation:
15² + 36² = 39²
How generous
x+3=8
minus 3 both sides
x+3-3=8-3
x+0=5
x=5