Question

please answer this question​

Answer 1

EXPLANATION.

(7) : Subtract.

⇒ 8mn - 9m + 2n  from  - 5n + 3m + 10mn.

As we know that,

We can write equation as,

⇒ (- 5n + 3m + 10mn) - (8mn - 9m + 2n).

⇒ - 5n + 3m + 10mn - 8mn + 9m - 2n.

⇒ 10mn - 8mn + 9m + 3m - 5n - 2n.

⇒ 2mn + 12m - 7n.

(8) : Subtract.

⇒ 3x² - 8yx  from  - 3xy + 4x².

As we know that,

We can write equation as,

⇒ (- 3xy + 4x²) - (3x² - 8yx).

⇒ - 3xy + 4x² - 3x² + 8yx.

⇒ 4x² - 3x² + 8yx - 3xy.

⇒ x² + 5yx.

⇒ x(x + 5y).

(9) If p = - 1.

Find value of : 7(p - 9) - 8(1 - p).

As we know that,

Put the value of p = -1 in the equation, we get.

⇒ 7(- 1 - 9) - 8(1 - (-1)).

⇒ 7(- 10) - 8(2).

⇒ - 70 - 16.

⇒ - 86.

(10) : If x = - 2  and  y = - 3.

Find the value of : 3x(5 - y) - 2y(6 + x).

Put the value of x = - 2  and  y = - 3 in the equation, we get.

⇒ 3(- 2)[5 - (-3)] - 2(-3)[6 + (-2)].

⇒ (-6)[5 + 3] + 6[6 - 2].

⇒ (-6)[8] + 6[4].

⇒ - 48 + 24.

⇒ - 24.

Answer 2

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EXPLANATION.

(7): Subtract.

→ 8mn - 9m - 2n from - 5n+3m +

10mn.

As we know that,

We can write equation as

→ (-5n+3m +10mm) - (8mn - 9m + 2n)

+-5n+3m +10mn - 8mm + 9m - 2n,

→ 10mm - 8mn +9m +3m - 5n - 2n

→ 2mn +12m-7n.

(8): Subtract

- 3x²-8yx from - 3xy + 4x².

As we know that, We can write equation as,

- (+ 3xy + 4x²)-(3x²-8yx).

➡-3xy + 4x²-3x² + 8yx.

4x²-3x+8yx-3xy.

= x² + 5yx

→ x(x + 5y).

(9) If p=-1.

Find value of: 7(p-9)-8(1-p).

As we know that,

Put the value of p=-1 in the equation, we get.

7(-1-9)-8(1-(-1)).

7(-10)-8(2).

<--70-16.

<--86

(10): If x=-2 and y=-3. Find the value of: 3x(5-y)-2y(6 + x).

Put the value of x=-2 and y=-3 in the equation, we get.

3(-2)[5-(-3)]-21-3 [6+ (-2)].

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

- (-6)[8] + 6[4]

-48 +24.

<--24.