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# What equals 5 r2?

Updated: 9/18/2023

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Q: What equals 5 r2?
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### Equation x2 plus Bx plus c equals 0 has 5 as the sum of its roots and 15 as the sum of the squares of its roots The value of 'c' is equals?

x2 - (-b/a)x + (c/a) = 0 or x2 - (sum of the roots)x + (product of the roots) = 0 Let the roots be r1 and r2. So we have: r1 + r2 = 5 (r1)2 + (r2)2 = 15 r1 = 5 - r2 (express r1 in term of r2) (5 - r2)2 + (r2)2 = 15 25 - 10r2 + (r2)2 + (r2)2 = 15 2(r2)2 - 10r + 25 = 15 (subtract 15 to both sides) 2(r2)2 - 10r + 10 = 0 (divide by 2 to both sides) (r2)2 - 5r + 5 = 0 (use the quadratic formula) r2 = [-b + &amp;- sq root of (b - 4ac)]/2a r2 = {-(-5) + &amp;- sq root of [(-5)2 - 4(1)(5)]}/2(1) = [5 + &amp;- sq root of (25 - 20)]/2 = (5 + &amp;- sq root of 5)/2 r1 = 5 - r2 r1 = 5 - (5 + &amp;- sq root of 5)/2 Thus, when r2 = (5 + sq.root of 5)/2, r1 = (5 - sq.root of 5)/2 or vice versa. Since the given equation is x2 + bx + c = 0, a = 1, then c equals to the product of roots. So that, c = (r1)(r2) = [(5 - sq.root of 5)/2][(5 + sq.root of 5)/2] = [52 - (sq.root of 5)2]/4 = 5

3ohm

### What is r2 equals 17?

If: r2 = 17 Then: r = the square root of 17

### What is 5 plus 6 equals plus 9?

It's an incorrect statement. 5 plus 6 equals plus 11. Also, pi R round, cornbread R2 .

### In 2x plus 6y equals 32 what is x?

2x plus 6y equals 32 32 divided by 6= 5 R2 5+2= 7x6= 42-5=37-2=35 so X=5

### What is the volume of a cylinder when d equals 6 and h equals 5?

Volume = pi R2 HR = 1/2 DV = pi (3)2 (5) = 45 pi = 141.372 cubic units (rounded)

### What is the answer for V equals π r2h for h?

V = (pi) R2 hDivide each side of the equation by (pi)R2 :h = V/(pi)R2

r -31

### R² plus r-20 equals 0?

r2 + r - 20 = 0(r + 5)(r - 4) = 0r + 5 = 0 or r - 4 = 0r = -5 or r = 4

### What is pi times r2?

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### R2 plus 10r plus 25?

The quadratic expression: r2+10r+25 = (r+5)(r+5) when factorised

### Y varies directly as the square of r If y equals 405 when are equals 9 find y when are equals 2?

y / r2 = a constant (k) so k = 405/81 ie 5. k = y/4 when r = 2, so y = 20.