2. If p = 1+ 2, find the value of:
(a) 4p-7
(b) – 3p2 + 4p + 7
(c) -7p2 + 4p+ 8
(d) - 6p + 7 + p2?
(e) - 3p+p?
(f) - 5p + 7p2
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Answers
Correct question:
If p = 1 + 2, find the value of:
(a) 4p-7
(b) – 3p² + 4p + 7
(c) -7p² + 4p+ 8
(d) - 6p + 7 + p²
(e) - 3p+p
(f) - 5p + 7p²
SoluTion:
Given that, p = 1 + 2 => 3
Put p = 3
(1). 4p - 7
→ 4(3) - 7
→ 12 - 7
→ 5
(2). -3p² + 4p + 7
→ -3(3)² + 4(3) + 7
→ -3(9) + 12 + 7
→ -27 + 19
→ -8
(3). -7p² + 4p + 8
→ -7(3)² + 4(3) + 8
→ -7(9) + 12 + 8
→ -63 + 12 + 8
→ -43
(4). -6p + 7 + p²
→ -6(3) + 7 + (3)²
→ -18 + 7 + 9
→ -2
(5). -3p + p²
→ -3(3) + (3)²
→ -9 + 9
→ 0
(6). -5p + 7p²
→ -5(3) + 7(3)²
→ -15 + 7(9)
→ -15 + 63
→ 48
Solution :-
It is Given that,
p = 1+2 = 3.
So, We Can Put the value Of p and can find the value easily.
[A] 5.
➲4p-7
➲4(3)-7
➲12-7.
➲5.
[B] -8.
➲-3p² + 4p + 7.
➲-3(3)² + 4(3) + 7.
➲-27 + 12 + 7.
➲-8.
[C] -48.
➲-7p² + 4p + 8.
➲-7(3)² + 4(3) + 8.
➲-48.
[D] -2.
➲-6(3) + 7 + 3²
➲-18 + 7 + 9.
➲ -2.
[E] -3.
➲-3p + p.
➲-3(3) + (3).
➲-3.
[F] 48.
➲-5p + 7p²
➲-5(3) + 7(3)²
➲-15 + 63.
➲48.
So, Your All Answers Are :-
- 5.
- -8.
- -48.
- -2.
- -3.
- 48.