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1.Solve by factorisation:

2x2+3x-20=0

 

2.:

 

 Mar 25, 2020
edited by Guest  Mar 25, 2020
 #1
avatar+1968 
+1

1) 

 

(2x-5)(x+4)

Set each to 0

2x-5=0

x+4=0

 

This will get you x=-4 or x=5/2

 

Hope this helped!

 Mar 25, 2020
 #2
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Tysm! It helped ALOT UwU

Guest Mar 25, 2020
 #3
avatar+23646 
+1

Larger rectangle area = L x W  =   3x ( x-2)  = 3x^2 -6x

Smaller area                             =  x (x-4)      =  x^2 - 4x       summed = 36 (given)

 

3x^2 - 6x       +     x^2 - 4x     = 36     combining terms

4x^2 - 10x - 36 = 0     divide through by 2

2x^2  - 5x - 18 = 0        solve for 'x' with quadratic formula or factoring

(2x - 9) (x +2) = 0      so x = 9/2    or   -2 (throw out)

 Mar 25, 2020
 #4
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0

Thanks!

Guest Mar 30, 2020

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