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Solve the following equations x^2-2x+4=0, x^2+4x+1=0

x 2 -2x+4= (x-2)(x-2)=0 x=-2 (double root) x 2 +5x+1=0 x 1,2 = -5+_ (5 2 -4(1)(1) ) 0.5 /2 x 1 =4.8 x 2 =-0.2 (to 1 d.p.)
KF
Answered by Kyriakos F. • Maths tutor
3689 Views

Work out 51% of 400?

51/100 * 400 = 51/100 * 400/1 = 51/1 * 4/1 = 204
TT
Answered by Thana T. • Maths tutor
6223 Views

There are a total of 50 apples and pears (apples + pears) in a large basket. If the total number of apples was doubled and the total number of pears was tripled, these two numbers would add up to 130. How many apples and pears are in the basket?

Solve this simultaneously. Where a= apples and p= pears, a+p=50 and 2a+3p=130 Multiply a+p=50 by 2 on both sides to get: 2a+2p=100 Then subtract the two equations from each other: 2a+3p=130 2a+2p=100 -------...
CB
Answered by Christopher B. • Maths tutor
3751 Views

f(x)=2x+c, g(x)=cx+5, fg(x)=6x+d; c and d are constants. Work out the value of d

f(g(x))=2(cx+5)+c fg(x)=2cx+10+c 2cx=6x 2c=6 c=3 10+c=d d=13
IB
Answered by Imogen B. • Maths tutor
6271 Views

Make x the subject of 3y + 2x = 6y - x/2

Multiply whole equation by 2 6y + 4x = 12y - x Take 6y from both sides 4x = 6y - x Add x to both sides 5x = 6y divid both sides by 5 x = 6/5(y)
BP
Answered by Ben P. • Maths tutor
4009 Views