All categories

2 years ago

If y=2x^2-5x-3 find the value of y if x= -1

Mathematics

1 answer:

Gelneren [198K]2 years ago

8 0

Answer:

y = 4

Step-by-step explanation:

First we want to raise -1 to the power of 2

y = 2 * 1 - 5 * -1 - 3

Multiply

2 - 5 * -1 - 3

Multiply

y = 2 + 5 - 3

y = 7 - 3

y = 4

You might be interested in

‍♀️✨✌️CAN SOMEONE PLS HELP I NEED THIS TURNED IN BEFORE 12 ‍♀️

Alenkasestr [34]

Answer:

BUDDY YOU OUT OF LUCK

Step-by-step explanation:

5 0

2 years ago

A board of length 7 divided by the quantity x minus 2 end of quantity meters was cut into two pieces. If one piece is 3 divided

bulgar [2K]

Answer:

Length of other board $=\frac{4x+20}{x^{2} -4}$ metres

Step-by-step explanation:

Given: Length of board = $\frac{7}{x-2}$ metres

Length of board was divided into two.

Length of one piece = $\frac{3}{x+2}$ metres

Let $l$ = length of the other board

Length of the other board = Length of board - Length of one piece

So, $l=\frac{7}{x-2}-\frac{3}{x+2}$

$l=\frac{7(x+2)-3(x-2)}{(x-2)(x+2)} \\\\l=\frac{7x+14-3x+6}{x^{2} -4} \\\\l=\frac{4x+20}{x^{2} -4}$

Thus, length of the other board $=\frac{4x+20}{x^{2} -4}$ metres

4 0

3 years ago

Find tsa of cylinder whose height is 7cm and radios 4cm.

ki77a [65]

Answer:

Answer

Let height =h

Total surface area=2πr(r+h)

r=7cm

⇒968=2×

×7(7+h)

⇒

968

=7+h

⇒h+7=22

⇒h=22−7

=15cm.

Step-by-step explanation:

6 0

2 years ago

-3(x-4)=2x+4-x

Rudik [331]

Answer:

C. x=2

Step-by-step explanation:

-3(x-4)=2x+4-x

-3x+12=x+4

+3x +3x

-----------------------

12=4x+4

-4 -4

-----------------------

8=4x

-- ---

4 4

-----------------------

x=2

5 0

3 years ago

5. Simplify<br> (7x2+ 8) - (x2 - 2)

Gennadij [26K]

Answer:

$(7 \times 2 + 8) - ( {x}^{2} - 2) \\ (14 + 8) - ( {x}^{2} - 2) \\ 14 + 8 - {x}^{2} + 2 \\ 22 + {x}^{2} + 2 \\ 24 + {x}^{2}$

ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ

3 0

2 years ago

If y=2x^2-5x-3 find the value of y if x= -1​

If y=2x^2-5x-3 find the value of y if x= -1