Answer:
The value of rate of which the base is changing = - 3
Step-by-step explanation:
Area = 20
height = 4 cm
we know that area of the triangle is given by
B = 10 cm
Rate of change of area is given by
4 = 0.5 [10 × 2 + 4 ]
= - 3
This is the value of rate of which the base is changing.
Answer:
see explanation
Step-by-step explanation:
(a)
x² - 2x - 4
using the method of completing the square
add/subtract ( half the coefficient of the x- term )² to x² - 2x
= x² + 2(- 1)x + 1 - 1 - 4
= (x - 1)² - 5
with c = - 1 and d = - 5
(b)
x² - 2x - 4 = 0 ← using result from (a) , that is
(x - 1)² - 5 = 0 ( add 5 to both sides )
(x - 1)² = 5 ( take the square root of both sides )
x - 1 = ± ( add 1 to both sides )
x = 1 ±