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Oksana_A [137]
2 years ago
11

5. Simplify the expression and find its value when p= 4 and q = -5:

Mathematics
2 answers:
Ierofanga [76]2 years ago
7 0
  • <u>Answer</u>: -180

Step-by-step explanation:

\bf   \blue{ \boxed{  \bf p = 4 \:  \: and \:  \: q =  - 5 \Rightarrow pq = 4 \times ( - 5) =  - 20}}

3(p2q + pq2 - pq) - 6pq + 3pq2 =

3[-20 × 2 + (-20) × 2 - (-20)] - 6 × (-20) + 3 × 2 × (-20) =

3[-40 + (-40) + 20] - 6 × (-20) + 3 × 2 × (-20) =

3(-40 - 40 + 20) - 6 × (-20) + 3 × 2 × (-20) =

3(-80 + 20) - 6 × (-20) + 3 × 2 × (-20) =

3 × (-60) - 6 × (-20) + 3 × 2 × (-20) =

-180 + 120 + 6 × (-20) =

-180 + 120 + (-120) =

-180 + 120 - 120 =

-60 - 120 = -180

Andrei [34K]2 years ago
7 0

Answer:

-180

Step-by-step explanation:

3 ( p2q + Pq2 - pq ) - 6 pq +3pq2

3 [(4)(2)(-5) + (4)(-5)(2) - (4)(-5)] -6 (4)(-5) +3(4)(-5)(2)

3(-40-40+20) + 120 -120

3(-60) +0

-180+0

-180

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