Green Bridge Learning Resource Nchekwa Maka Cubic Inequalities

Gbogbo ọrọ náà

A cubic inequality asks where a cubic curve lies above or below a given level. The quickest reliable method is to sketch the curve from its factors and read off the intervals, rather than juggle algebra blindly.

In this lesson you will solve graphically cubic inequalities of the form \(f(x) > d\), \(f(x) \geqslant d\), \(f(x) < d\) or \(f(x) \leqslant d\), where \(f(x)\) is a product of three linear factors.

Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Cubic Inequalities. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

The roots of (x + 2)(x - 1)(x - 3) = 0 are: A. 2, 1, 3 B. -2, 1, 3 C. -2, -1, -3 D. 2, -1, 3 Answer: B
Solve (x + 2)(x - 1)(x - 3) > 0. A. x < -2 or 1 < x < 3 B. -2 < x < 1 or x > 3 C. -2 < x < 3 D. x > 3 only Answer: B
At a simple root, a cubic graph: A. touches the axis B. crosses (changes sign) C. is undefined D. is flat Answer: B
For f(x) >= d (not strict), the roots are: A. excluded B. included C. ignored D. doubled Answer: B
The best first step for a cubic inequality is to: A. differentiate B. find roots and sketch C. integrate D. complete the square Answer: B