Question

........................................................................pls tell the answers......................................................

Answer 1

Answer:

1. If x= -1 substitute it on the eq: x² -⅕.

= (-1)² -⅕

= 1 - ⅕

= 5/5 -⅕

= ⅘.

2. If the value of x and y are 0 and 0 respectively,

then x² + y² -10:

= (0)² + (0)² -10

= -10.

3. The product of 9a × 4ab × (-2a)

= -18a² × 4ab

= -72a³b.

6. (99)² can be splited by (100-1)².

= (a - b)² = a² - 2ab + b²

= (100-1)² = 100² - 2(100)(-1) + (-1)².

= 10000 - 200 + 1.

= 9801.

7. Simplification:

x(2x-1) +5 = 2x² - x + 5.

substitute x= -2 on the resulting eq.

=2(-2)² -(-2) +5.

= 8 + 2 + 5.

= 15.

8.(95)² can be written as (90 + 5)².

by the formula:

(a + b)² = a² + 2ab + b².

that is,

(90 + 5)² = 90 ² + 2(90)(5) + 5².

= 8100 + 900 + 25.

= 9000 + 25.

= 9025.

I don't know about the 4 and 5.

SORRY...

Step-by-step explanation:

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