X^2+4x=7 using the quadratic formula?

Answers

Answer 1

Answer: when you have
ax^2+bx+c=0
x= $\frac{-b+/- \sqrt{b^(2)-4ac} }{2a}$

1x^2+4x=7
minus 7
1x^2+4x-7=0
a=1
b=4
c=-7
sub

x= $\frac{-4+/- \sqrt{4^(2)-4(1)(-7)} }{2(1)}$
x= $(-4+/- √(16+28) )/(2)$
x= $(-4+/- √(44) )/(2)$
x= $(-4+/- 2√(11) )/(2)$
x= $-2+/- √(11)$

x= $-2+ √(11)$ or $-2- √(11)$

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Round 76340 to the nearest thousand

Answers

76340 to the nearest thousands is:

Rounded Number:
76000

Since 76340 isn't up to 5.

Hope this helps!! ^-^

What is 1284 rounded to the nearest 100?

Answers

1284 rounded to the nearest would be 1300

1300 because it is 84 so you round up to 300

Solve the perimeter of the plot that is 2(x-1) + 2(3x + 2)

Answers

$2(x-1) + 2(3x + 2)$

$2x-2+6x+4$ $Expand$

$(2x+6x)-2+4$ $\ Gather \ like \ terms$

$8x-2+4$

$8x+2$

What is 2 3/4 minus 1 5/16?

Answers

Hey there, 2 3/4=11/4 and 1 5/16=21/16, 11*16-21*4/4*16=176-84/64=92/64, 92/64 simplified is 23/16, 23/16 as a mixed number is 1 7/16. Therefore, 2 3/4 minus 1 5/16 = 1 7/16

2 3/4= 11/4 which can be multiplied by 4 to be 44/16. 44-22 equals 22, therefore the answer is 22/16, which can be simplified to 11/8 or 1 3/8.

The point (0,0) is a solution to which of these inequalities?

Answers

The point (0,0) is a solution of (y - 5 < 3x - 4) and this can be determined by substituting the value of (x = 0) and (y = 0).

Given :

Point -- (0,0)

Check all the options in order to determine the inequalities whose solution is (0,0).

A) y + 5 < 3x - 4

Substitute the value of (x = 0) and (y = 0) in the above in equality.

5 < -4 which is not true. Therefore, this option is incorrect.

B) y - 4 < 3x - 5

Substitute the value of (x = 0) and (y = 0) in the above in equality.

-4 < -5 which is not true. Therefore, this option is incorrect.

C) y + 5 < 3x + 4

Substitute the value of (x = 0) and (y = 0) in the above in equality.

5 < 4 which is not true. Therefore, this option is incorrect.