if 7 is subtraced from 5 times a number, answer is 35 more than twice the number
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Answered by
0
Answer:
L.H.S. = x2 – y2
= (p sec θ + q tan θ)2 – (p tan θ + q sec θ)2
= p2 sec θ + q2 tan2 θ + 2 pq sec 2 tan 2 -(p2 tan2 θ + q2 sec2 θ + 2pq sec θ tan θ)
= p2 sec θ + 2 tan2 θ + 2pq sec θ tan θ – p2 tan2 θ – q2 sec θ – 2pq sec θ tan θ
= p2(sec2 θ – tan2 θ) – q2(sec?2 θ – tan2 θ) =
= p2 – q2 …[sec2 θ – tan2 θ = 1
= R.H.S.hii
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Answered by
1
Answer:
Step-by-step explanation:
Let number is X.
Then two time of number is 2x.
7time of number is 7x.
Subtraction is 2x-7x = 5 ……(1)
-5x = 5.
X = 5/-5 = -1
X = -1.
Verification.
Taking the value of X in equation (1)
2(-1) -7(-1)
-2+7= 5.
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