ALGEBRA 8A

 

Calculate the value of 4x - k + 80 + y , when x = 8, k = 10 and y =− 33 .

 

Solution

 

=4x - k + 80 + y

 

=4(8) - 10 + 80 + (-33)

 

=4(8) - 10 + 80 + (-33)

 

=32 - 10 + 80 – 33

 

=32 + 80 – 10 – 33 (Grouping +ve and -ve no's together)

 

 

= 112 – 43

 

= 69 answer

TRY THIS.............................. 

 

Calculate the value of 8x - k + 40 + y, when x = 5, k = 20 and y =− 10 .

DETERMINANT

 

CIRCLES

 

 

INEQUALITIES

 

If 4x + 8 ≥ 7 + 3x ≥ 9x – 10; find x.

 

Solution

 

4x + 8 ≥ 7 + 3x and  7 + 3x ≥ 9x - 10

 

4x – 3x ≤ 7 - 8 and  7 +10 ≤ 9x - 3x

 

x ≤ -1 and  17 ≤ 6x

 

x ≤ 1  and  17 ≤ 6x

                    6      6

 

x ≤ 1 and  ¹⁷/6 ≤ x

 

x ≤ 1 and  x  ≥ ¹⁷/6

 

TRY THIS…………….

 

 If 12x + 18 ≥ 7 + 3x ≥ 9x – 29; find x

WORD PROBLEMS

 

For more math videos visit my channel at the link below:  

GCSE Maths on You Tube.

LOGARITHMS

 

If Log_aw = 50, find Log_a(¹/w).

 

Solution

 

= Log_a(¹/w)

 

= Log_aw^-1

 

= -1 x Log_aw

 

= -1 x 50

 

= -50

 

 

TRY THIS………..

 

If Log_am= 67, find Log_a(¹/m)

VARIATIONS

 

For more math videos visit my channel at the link below:  

Math Videos

CO-ORDINATE GEOMETRY

 

For more math videos visit my channel at the link below: 

GCSE Maths on YouTube